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Touch Sensor - Monitoring Touch Sensor from Webpage with Image

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  • Touch Sensor - Monitoring Touch Sensor from Webpage with Image


    Tutorial Video



    Hardware
    • PHPoC Blue (+ USB WLAN) or PHPoC Black (+ Ethernet cable)
    • Micro USB to USB Cable (to upload source code to PHPoC Device)
    • Touch Sensor
    • Jumper Cable


    About Touch Sensor

    Touch sensor is used to detect the touch of finger. The touch sensor used in this example includes three pins:
    • VCC pin.
    • GND pin.
    • Signal pin (outputs digital signal).
    How the touch sensor works:
    • If sensor is touched by finger, value of the sensor's signal pin is HIGH (VCC).
    • Otherwise, value of sensor's signal pin is LOW (0 V).
    How to use touch sensor:
    • By reading value of sensor's signal pin, we can infer state of touch sensor. To read value of sensor's signal pin, we just need to connect the sensor's signal pin to PHPoC device's input pin and use PHPoC code to read the value.
    We can use another kind of touch sensor instead, even if it has different pinout, for example:We can use the source code of this example if its working principle is the same as the touch sensor used in this example.




    Wiring Diagram



    Quick Steps

    Source code of this example is a part of PHPoC Support Packet (PSP). You need to:
    • Download PHPoC Support Package.
    • Upload example\p4s\03.html_image\01.uio_touch_sensor to PHPoC Blue/Black.
    • Configure network parameters (e.g. WiFi SSID, password, IP address ...).
    • Access webpage on PHPoC using Web Browser on your PC or smart phone (See How To).
    If you use PHPoC for the first time, see How To Use PSP.


    Source Code

    Source files includes:
    • index.php: this file contains source code of web page.It is only run in response to request from Web Browser.
    • uio_touch_sensor.jpg: Wring diagram between PHPoC devices and touch sensor. It is displayed on webpage.

    index.php

    [Full Code]
    PHP Code:
    <html>
    <head>
    <title>PHPoC / <?echo system("uname -i")?></title>
    <meta name="viewport" content="width=device-width, initial-scale=0.5">
    <style> body { text-align: center; } </style>
    </head>
    <body>

    <h2>

    UIO / Catalex Touch Sensor<br>

    <img src="uio_touch_sensor.jpg"><br>

    <?php

    include_once "/lib/sd_340.php";

    define("IN_PIN"0);

    uio_setup(0IN_PIN"in");

    $touch uio_in(0IN_PIN);

    if(
    $touch)
     echo 
    "touch ON<br>\r\n";
    else
     echo 
    "touch OFF<br>\r\n";

    ?>

    <br><a href="index.php">reload</a><br>

    </h2>

    </body>
    </html>



    [Explanation]

    Source code of index.php file is composed of HTML, CSS and PHPoC code.

    PHPoC code is interpreted on on PHPoC device.
    • PHP Code:
      <?php

          
      include_once "/lib/sd_340.php";

          
      define("IN_PIN"0);

          
      uio_setup(0IN_PIN"in");

          
      $touch uio_in(0IN_PIN);

          if(
      $touch)
           echo 
      "touch ON<br>\r\n";
          else
           echo 
      "touch OFF<br>\r\n";

          
      ?>
    This code does:
    • Setup IO pin. which connected to the sensor to input mode.
    • Read value of input pin.
    • Print state of touch sensor based on value of input pin to webpage.


    PHPoC code may add/update the content of HTML, CSS or JavaScript code. Once PHPoC code is interpreted in PHPoC, the remaining code is client-side code and it is returned to Web Browser. Web Browser receives this code and interpret it to display the webpage.
    • HTML: describes the structure of Web pages
    • CSS: describes how HTML elements are to be displayed
    For detail explanation, see How to Monitor Sensors/Devices via HTTP Request




    See Also

    Other Resources
    Last edited by support; 02-09-2018, 08:56 AM.
      Posting comments is disabled.

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